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Oxygen doping of P3HT:PCBM blends: Influence on trap states, charge carrier mobility and solar cell performance

Authors
Journal
Organic Electronics
1566-1199
Publisher
Elsevier
Publication Date
Volume
11
Issue
10
Identifiers
DOI: 10.1016/j.orgel.2010.07.016
Keywords
  • Organic Solar Cells
  • Oxygen
  • Degradation
  • Tsc
  • Celiv
  • Macroscopic Simulation
Disciplines
  • Mathematics

Abstract

Abstract We investigated the influence of oxygen on the performance of P3HT:PCBM (poly(3-hexylthiophene):[6,6]-phenyl C61 butyric acid methyl ester) solar cells by current–voltage, thermally stimulated current (TSC) and charge extraction by linearly increasing voltage (CELIV) measurement techniques. The exposure to oxygen leads to an enhanced charge carrier concentration and a decreased charge carrier mobility. Further, an enhanced formation of deeper traps was observed, although the overall density of traps was found to be unaffected upon oxygen exposure. With the aid of macroscopic simulations, based on solving the differential equation system of Poisson, continuity and drift-diffusion equations in one dimension, we demonstrate the influence of a reduced charge carrier mobility and an increased charge carrier density on the main solar cell parameters, consistent with experimental findings.

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